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[Comparative study of human erythrocyte membranes in normal people and in Huntington's chorea patients]
Insights
Erythrocyte (red blood cell) membranes show significant alterations in Huntington's chorea patients, including decreased osmotic resistance and increased Na+, K+-ATPase activity. These findings suggest underlying cellular changes contributing to the disease.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Huntington's chorea is a neurodegenerative disorder.
- Erythrocyte membrane integrity is crucial for cellular function.
- Understanding cellular changes in Huntington's chorea may reveal disease mechanisms.
Purpose of the Study:
- To investigate erythrocyte membrane alterations in Huntington's chorea patients.
- To compare cellular membrane properties between patients and healthy controls.
- To identify potential biomarkers for Huntington's chorea.
Main Methods:
- Measurement of erythrocyte osmotic resistance.
- Assay of Na+, K+-ATPase activity in erythrocyte membranes.
- Two-dimensional electrophoresis for protein composition analysis.
- Ficoll density gradient centrifugation to study erythrocyte aging.
Main Results:
- Erythrocytes from Huntington's chorea patients exhibited significantly decreased osmotic resistance.
- Na+, K+-ATPase activity was markedly increased (4-fold) in patient erythrocytes compared to controls.
- Visual analysis of electrophoretograms showed similar protein composition, but one patient had an additional protein (Mr = 30,000).
- A slowly sedimenting erythrocyte fraction was observed in most patients but not in healthy individuals.
Conclusions:
- Erythrocyte cell membranes are altered in Huntington's chorea.
- These alterations include changes in osmotic fragility and ion pump activity.
- The presence of a unique erythrocyte fraction suggests abnormal cellular aging or membrane properties in the disease.
Abstract:
Erythrocytes of healthy volunteers and of patients with hereditary chorea were studied. Evaluation of the state of cellular membrane was carried out by measuring osmotic resistance, activity of Na+, K(+)-ATPase and protein composition. In the patients osmotic resistance of erythrocytes was distinctly decreased down to 66.3 +/- 3.3, while the Na+, K(+)-ATPase activity was increased 4-fold as compared with controls. Protein composition of erythrocyte membranes, studied by means of two-dimensional electrophoresis, was similar both in healthy persons and in patients with hereditary chorea when the electrophoretograms were analyzed visually. An additional protein with Mr = 30,000 and r-1-0.25 was detected in one of the patients. Slowly sedimenting fraction of erythrocytes was found in almost all the patients with hereditary chorea when erythrocytes aging was studied by means of fractionation in Ficoll density gradient. The fraction was not observed in healthy persons. These data suggest that the cell membranes in Huntington's chorea are altered as compared with normal state.